Am 30.11.2017 um 17:14 schrieb And:

> This picture is subsurface material version. When translucency rise. It is not
>  like cloud enough. I'm not very knowing why. Cause when cloud is not dense it
> should like be.

My best guess is that it doesn't look anything like clouds because in
clouds you have a somewhat gradual change in the density of water
droplets, whereas the subsurface light transport model is designed for
cases where the density of the scattering agent changes abruptly at a
well-defined surface.

Directionality of scattering may also play a role (POV-Ray's current
implementation only supports isotropic scattering), but I don't think it
matters much in this case.

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